A study by [1]} built a sample of 2017 open clusters that were either already known to be present in Gaia DR2 [2]}, or newly detected in the same data release ([3]} [3]}, [5]}, [6]} [6]} and [8]} [8]}). This sample was updated using the new astrometric parameters available in Gaia EDR3. Using that sample, they re-determine the current shape of the Perseus, Local, Sagittarius and Scutum Galactic spiral arms. [1]} also provided an estimation of the angular speed of each spiral patterns \(\Omega _{p}\) .
